Mammary cancer is probably the commonest cancer seen among hospitalized women. As much or more has been written regarding breast cancer as about any other cancer, and many types of therapies have been proposed. Inasmuch as human breast cancer is a current controversial therapeutic subject, this study was undertaken to help guide our future efforts by past experience. While the issues of superradical surgery, radical surgery, and limited surgery, with or without radiation, are contested, there lurks forever the question of how influential is therapy. We believe that the prognosis for the breast cancer patient is related to therapy, but prognosis and results are by no means dependent upon therapy alone. To aid our future patients, it appeared that data about the effectiveness of past curative attempts should be obtained. In addition, certain information might be had to suggest possible changes. Material This series of 1661 patients with breast carcinoma